问一个sort命令

max_xy

sort -k 1,1 -k 2n
这句话里的2n是什么意思阿？

linux_now

[HTML]Note that if you had written `-k 2n' instead of `-k 2,2n' `sort'
would have used all characters beginning in the second field and
extending to the end of the line as the primary _numeric_ key. For
the large majority of applications, treating keys spanning
more than one field as numeric will not do what you expect.

Also note that the `n' modifier was applied to the field-end
specifier for the first key.  It would have been equivalent to
specify `-k 2n,2' or `-k 2n,2n'.  All modifiers except `b' apply
to the associated _field_, regardless of whether the modifier
character is attached to the field-start and/or the field-end part
of the key specifier.
[/HTML]
2的意思好理解，n 即是 -n

Chowroc

加n表示按数字大小排序，比如123, 23, 12,
# sort -k1
12
123
23

# sort -k1n
12
23
123